The Touchet River /ˈtuːʃi/ is a 55-mile (89 km) tributary of the Walla Walla River in southeastern Washington in the United States. The Touchet River drains an area of about 740 square miles (1,900 km2) in Columbia County and Walla Walla County. The USGS cited two variant names, Pouchet River and Toosha River.